ANATOMY

Detailed explanation-1: -Sinoatrial node (SA node) is located on the wall of the right auricle/atrium, near the opening of the superior vena cava. It relays the impulse that starts a heart beat to the right ventricles with the help of special conducting fibres.

Detailed explanation-2: -The sinoatrial node (SAN), located in the right atrium, serves as the primary site for initiation of the normal heartbeat (sinus rhythm) (Figure 1).

Detailed explanation-3: -The SA node called the sinoatrial node lies in the wall of the right atrium near the opening of the superior vena cava. Q. Assertion :The SA node acts as pacemaker Reason: The SA node is located in the wall of the right atrium near the interatrial septum.

Detailed explanation-4: -The SA (sinoatrial) node generates an electrical signal that causes the upper heart chambers (atria) to contract. The signal then passes through the AV (atrioventricular) node to the lower heart chambers (ventricles), causing them to contract, or pump. The SA node is considered the pacemaker of the heart.

Detailed explanation-5: -The sinus node, the natural pacemaker of the heart, is located in the heart’s upper chamber, called the atrium. It is responsible for initiating the electrical impulse that travels through the heart, causing it to beat in a regular rhythm and heart rate.